"Bloody Valentine" is an original Japanese duet song featuring Kagamine Rin and Len. The Japanese version is exclusively featured in the album Zhònglì Huànxiǎng Qū. In 2014, a Mandarin duet version was published on bilibili and features Luo Tianyi and YANHE. The Mandarin version is featured in the album Fàngxué Hòu de Wénxuébù.